The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 28, 1986
Filed:
Jul. 22, 1985
Kazuhito Egami, Tokyo, JP;
Norimitsu Hirano, Kanagawa, JP;
Kabushiki Kaisha Shicoh Giken, Kanagawa, JP;
Abstract
A brushless d.c. motor is equipped with a stator armature, which is composed of a stator yoke and at least one armature coil arranged on the stator yoke, and a 2p(p: a positive integer of 1 or more)-pole magnetic rotor facing the stator armature, rotatable relative to the stator armature and having alternating N and S poles. The motor can self-start by utilizing a cogging torque produced upon feeding a direct current to a position sensor. The stator yoke defines at such a point as permitting self-starting of the magnet rotor a cut-off portion of such a shape that ensures the self-starting of the magnet rotor and provides an ideal composite torque curve. The brushless d.c. motor enjoys easy assembly work, low manufacturing cost, compact size, good performance, good mass productivity, etc. It is suited particularly as a disk-type brushless motor or disk-type burshless fan motor.